Burkert Type 8715 - Manual (Page 38)

38
Operationandfunction
Type 8700, 8701, 8703, 8705
The proportional solenoid valve is activated according to a predefined
profile resulting in flow-rate changes. Thereby several control settings
are adjusted to the conditions on-site. These settings are stored in
the non-volatile memory of the device at the end of a successfully run
Autotune function.
This function of the MFC is obtained by activating a binary input
(configured on this function) for at least 0.5 s. The Power LED (green)
flashes to signal that the function is in progress.
Warning
Various flow-rate changes occur when the Autotune is run.
• Do not switch off the power supply to the MFC.
• Keep the supply pressure constant.
→
Before activating the Autotune function, bring the medium
pressure to a pressure close to the calibration pressure.
While the Autotune function is running, the MFC is not controlling.
When the Autotune function ends, the MFC returns to the operating
mode it was in prior to activation.
8.3.3. safety function
In this operating mode, the device behaves as in control mode, except
that the set-point value is ignored and replaced by a predefined safety
set-point value. The default safety set-point value is 0%. This can be
modified with the "Mass Flow Communicator" PC software.
This function of the MFC is obtained by activating a binary input or via
the field bus, depending on the configuration of the device. The Limit
LED (blue) flashes to signal that the function is in progress.
8.3.4. set-point value profile
In this operating mode, the device behaves as in standard control mode,
except that the external set-point value is ignored and replaced by a
predefined chronology of up to 30 flow-rate values (configurable with
the "Mass Flow Communicator" PC software).
This function of the MFC is obtained by activating a binary input
(configured on this function) for at least 0.5 s. The Limit LED (blue)
flashes to signal that the function is in progress.
If the set-point value profile has been activated by binary input and
the input has been reset, once the set-point value profile has been
executed, the device returns to the operating mode it was in prior to
activation.
8.3.5. control mode
In this operating mode, the set-point value enables a duty cycle to be
directly supplied to the proportional valve, for example set-point value
10% → duty cycle of the valve = 10%.
This function of the MFC is obtained by activating a binary input or via
the field bus, depending on the configuration of the device (configurable
with the "Mass Flow Communicator" PC software). The Limit LED (blue)
flashes to signal that the function is in progress..
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